package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> withTree() {
        //查询所有分类
        List<CategoryEntity> entitys = baseMapper.selectList(null);
        List<CategoryEntity> collect = entitys.stream().filter((categoryEntity) ->
                categoryEntity.getParentCid() == 0
        ).map((categoryEntity -> {
            categoryEntity.setChildren(getChildres(categoryEntity, entitys));
            return categoryEntity;
        })).sorted((munu1, munu2) ->
                (munu1.getSort() == null ? 0 : munu1.getSort()) - (munu2.getSort() == null ? 0 : munu2.getSort())
        ).collect(Collectors.toList());
        return collect;
    }

    @Override
    public void removeCategorysByIds(Long[] catIds) {
        this.baseMapper.deleteBatchIds(Arrays.asList(catIds));
    }

    private List<CategoryEntity> getChildres(CategoryEntity categoryEntity, List<CategoryEntity> entitys) {
        List<CategoryEntity> collect = entitys.stream().filter((munu) -> categoryEntity.getCatId() == munu.getParentCid())
                .map((munu) -> {
                    munu.setChildren(getChildres(munu, entitys));
                    return munu;
                }).sorted((munu1, munu2) ->
                        (munu1.getSort() == null ? 0 : munu1.getSort()) - (munu2.getSort() == null ? 0 : munu2.getSort())
                ).collect(Collectors.toList());

        return collect;
    }

}